This is exactly how DS acts.  I think it comes from a strong sense of justice and a desire to understand how other people "work."  I see this need to learn about others very strongly in DS--the same he needed to know how to read.  When he was in Kindergarten there was a child who was being mean to everyone.  DS actually organized an "intervention."  He got together about 7 kids to go talk to him and explain how his behavior was affecting them.  And this kid actually got better.  DS still plays with this child 6 years later!
The teachers see this strength in DS and often place him near problem children because he does have a good effect on them.  And DS enjoys the challenge of trying to help them and so far it has not been a burden on DS.  DS's K teacher says that he will be a diplomat when he grows up because he takes such joy in negotiating difficult social situations.